古语云：“易有三训，一训简易，二训变易，三训不易”，“易与天地准”，之于常识，不也是如此吗？我们生活在常识中，“春暖花开”、“秋高气爽”，我们不假思索地运用它们，是为简易；同一事物不同时刻有不同的表现，变化无穷，是为变易；常识由生活而来，经久适用，是为不易。故庄子云：“道在便溺”。因常识，于生活，我们泰然。
As the old saying goes, "there are three kinds of training, one is simple, the other is variable, and the other is not easy." is not the same for common sense? We live in common sense, "spring is warm and flowers are blooming" and "autumn is crisp". We use them without thinking. It's for simplicity; the same thing has different performances at different times and changes endlessly. It's for change; common sense comes from life and is applicable for a long time. It's not easy. Therefore, Zhuang Ziyun said, "Tao is defecating.". Because of common sense, in life, we are calm.
老子云：“大象若希”。正是由于常识之于我们太过习惯了，时常，我们会无所察觉，如同时空之于我们过于静止与绝对，在爱氏之前，我们被蒙骗了千万年。于是我们在恍然后明白，常识虽常，但亦要知之、行之、思之。
Laozi said, "elephant is like hope.". It's because common sense is too used to us. From time to time, we will be unconscious, just as time and space are too static and absolute for us. Before Ai Shi, we have been deceived for thousands of years. So we suddenly understand that although common sense is common, we need to know it, do it and think about it.
所谓的对常识的知之，并非仅仅为热则却衣寒则添衣的自然反射，而是对自然存在的用心观察。没有这用心，何来常识？没有常识，何以行之？不得而行之，必遭祸患。譬如之于人，了解交通拥挤之时间，于约会便不会误时；又譬如拿破仑不知俄国之地广与冬天之寒冷，便因俄国坚壁清野而为滑铁卢之役埋下伏笔。
The so-called knowledge of common sense is not only the natural reflection of adding clothes to heat but to cold, but also the attentive observation of natural existence. Without this intention, why common sense? Without common sense, how can we do it? If you do not, you will suffer. For example, when people understand the time of traffic jam, they will not miss their appointments; when Napoleon does not know the vast territory of Russia and the cold winter, he will lay a foreshadowing for the battle of Waterloo because of Russia's strong walls and clear fields.
所以对于常识，要知之。
So for common sense, know it.
所谓的对常识的行之，不仅是于知之之后的体证，还是生活的必需，之所以要知且行，系因为知易而行难。行难，故特以行之。常识的知之，是困则眠、疲则休息，是诸葛顺势三分天下，是刘邦知楚强汉弱而强赴鸿门。对常识的行之，是顺应自然、顺时而动，故可避害趋利，所以才有一觉醒来的精神，才有汉朝天下。
The so-called practice of common sense is not only the physical evidence after knowledge, but also the necessity of life. The reason why we should know and act is that it is easy to know and difficult to act. It's difficult to walk, so it's special to walk. The common sense is that if you are sleepy, you will sleep, if you are tired, you will rest. It is Zhuge's three parts of the world according to the situation. It is Liu Bang who knows that Chu is strong and Han is weak, but he is strong and goes to Hongmen. The practice of common sense is to conform to the nature and move with the times, so it can avoid harm and pursue benefits. Therefore, there is an awakened spirit and the world of Han Dynasty.
所以对于常识，要行之。
So for common sense, do it.
至于对于常识的思之，那便是在知行合一后更高的要求。正因为常识之常，所以无形中被我们忽略、习惯，然世间万物莫不在变易中永恒，拘泥而行自己不适合，若死守既得，便永无进步可言。故汤之盘铭曰：“苟日新、日日新、又日新”；《康诏》曰：“作新民”；曾子曰：“君子无所不用其极”；因为对常识的思之，爱氏提出了相对论，玻尔提出了量子力学；之于历史的，不正是由于对意识形态的思之与变革，再知而行之，才有三十年改革开放而至于今日之中华崛起？
As for the thinking of common sense, it is a higher requirement after the unity of knowledge and practice. Just because common sense is so common, it is invisible that we neglect and get used to it. However, all things in the world are eternal in changes. It is not suitable to stick to what we have. If we stick to what we have, there will be no progress. Therefore, Tang zhipanming said: "to be new, to be new, and to be new"; Kang Zhao said: "to be a new people"; Zeng Zi said: "a gentleman has nothing to do with his extreme"; because of the thinking of common sense, Ai Shi put forward the theory of relativity, Bohr put forward the quantum mechanics; for history, it is not just because of the thinking and change of ideology, and then knowing and doing, that 30 years of reform and opening up have come The rise of China today?
“易与天地准”，也正是凭借常识，凭借与常识同行，我们维系了一个旷古的文明，然而无论是生活还是发展，不知常识无语进步，不行常识无以趋利避患，不思常识却也无以百尺竿头更进一步。
It is by common sense and common sense that we have maintained an ancient civilization. However, no matter in life or development, we don't know how to make progress without common sense. If we don't know how to make progress without common sense, we can't make progress without common sense. If we don't think about common sense, we can't make progress without common sense.
于是，不妨化用子思的“慎思之，明辨之，笃行之”而说，对于常识，我们要知之、行之、思之，由是，则有泰然的生活与不断的前进。
Therefore, we can use Zisi's "thinking carefully, distinguishing clearly, and practicing earnestly" to say that for common sense, we need to know, practice, and think. Therefore, we have a peaceful life and continuous progress.
